Microwave-induced coupling of superconducting qubits

TL;DR

This paper explores how microwave irradiation can induce tunable coupling between superconducting qubits, enabling tests of macroscopic entanglement and quantum gate implementation.

Contribution

It introduces a new effective Hamiltonian describing coupled superconducting qubits under microwave control, facilitating experimental quantum information processing.

Findings

Derived a new effective Hamiltonian for coupled qubits

Demonstrated tunable coupling at charge co-degeneracy point

Proposed applications for entanglement and quantum gates

Abstract

We investigate the quantum dynamics of a system of two coupled superconducting qubits under microwave irradiation. We find that, with the qubits operated at the charge co-degeneracy point, the quantum evolution of the system can be described by a new effective Hamiltonian which has the form of two coupled qubits with tunable coupling between them. This Hamiltonian can be used for experimental tests on macroscopic entanglement and for implementing quantum gates.